Slow build speeds with sip v6

[Nyall Dawson]

Hi list,

When moving to sip version 6 (v6.7.12) I've noticed a massive regression in
the compile times for a large project compared with sip 4 (v4.19.25) . It's
now taking around 10 minutes for the sip-build process to complete, whereas
on sip4 it was less than a minute.

(I'm using the sip / sip6 packages from Fedora 39, but I've also had
reports of the same performance regression for the Ubuntu packages)

Is this a known issue? Is there anything I can try to restore similar
performance to sip 4?

Thanks!
Nyall
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